Company lists · Data verified August 2026

Top 25 Email security companies based in the United States

Name: Email security companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 82 companies tracked

There are 82 email security companies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 1,644 professional contacts across them, including 417 with verified work emails and 519 with mobile numbers. Atlanta is the largest hub.

This list covers email security companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

82Companies

1,644Contacts tracked

417Verified emails

519Mobile numbers

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The 25 largest email security companies based in the United States

Ranked by team size

Top 25 of 82 email security companies based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Sublime Security	Washington, DC	201-500	237	50
2	ZIX	Dallas, TX	501-1,000	200	64
3	Ironscales	Atlanta, GA	51-200	165	97
4	ESOFT	Broomfield, CO	51-200	140	2
5	Powerdmarc	Middletown, DE	51-200	43	19
6	Mailprotector	Greenville, SC	11-50	42	27
7	Perception Point	Boston, MA	51-200	36	12
8	Abusix, INC	Boston, MA	11-50	32	14
9	Abnormal Security	San Francisco, CA	501-1,000	26	14
10	Cloudflare Area 1 Security	San Francisco, CA	51-200	23	14
11	Sendio Technologies, INC	Newport Beach, CA	11-50	19	3
12	Safeguard Cyber	Charlottesville, VA	51-200	18	3
13	Mailgate	Greenwood, IN	11-50	16	11
14	Spambrella	Dover, DE	51-200	15	5
15	Edgewave	La Jolla, CA	51-200	15	2
16	AGARI	Foster City, CA	51-200	14	3
17	Maysoft	Santa Barbara, CA	11-50	14	2
18	Duocircle	San Diego, CA	11-50	13	8
19	BLOXX	Newton, MA	51-200	13	2
20	inquest.net	Austin, TX	11-50	12	3
21	Greathorn	Waltham, MA	11-50	10	5
22	Ravenmail	Dallas, TX	11-50	10	4
23	Identillect Technologies INC	Poway, CA	11-50	10	3
24	ISP Cloud Services INC	Miami, FL	1-10	7	6
25	Criptext	New York, NY	1-10	6	3

Showing 25 of 82 email security companies based in the United States

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Email security companies based in the United States at a glance

As of Aug 28, 2026

11-50Median size (employees)

AtlantaLargest hub · 4 HQs

519Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email security companies by metro

Metro	Companies
Email security companies in Atlanta	4
Email security companies in Boston	4
Email security companies in New York	4
Email security companies in San Francisco	3
Email security companies in Chicago	3
Email security companies in Miami	3
Email security companies in Dallas	3
Email security companies in Pleasanton	2

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “email security companies”, with match quality audited by blind human judging, and headquartered in the United States.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many email security companies are there based in the United States?

There are 82 email security companies headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Sublime Security, headquartered in Washington, tops this list with the largest team on record.

Which city has the most email security companies?

Atlanta leads with 4 headquartered companies, followed by Boston (4) and New York (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 417 verified decision-maker contacts tracked across these 82 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph, the same data that powers RevenueBase's B2B data products and the free research portal.